Question about Denon AVR-900 Receiver

2 Answers

Yes when I hit the power button the standby light blinks 6 times and then stops and stays solid. Nothing else happens after that. Thanks for the help. Chris

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  • Chris Davis
    Chris Davis Aug 24, 2010

    Thanks for the suggestions. Maybe I can tell you what I have tried and you can guide me in the right direction. I pulled the cover off and checked the fuses. One was blown so I replaced it. when I hit the power button the unit made a loud hum and then blew the fuse and smoke came from around the front center of the main board.

  • Chris Davis
    Chris Davis Aug 24, 2010

    I took a picture maybe it will be easier to walk me through which parts will need to be replaced.

×

2 Answers

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  • Denon Master
  • 74,945 Answers

This indicates the output circuit of the amplifier is shorted out, this can be a defective power transistor or a shorted speaker wire or speaker, disconnect the speakers and try the amp, if the light doesn't flash u have your answer,if it still does the same thing u have a defective amplifier and need to have a shop repair it.

Posted on Aug 25, 2010

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  • Master
  • 5,807 Answers

• If you feel you can DIY, you may have to check for

Power Transistors , on the Main Amplifiers and have it

removed.


• If the Unit turns ON, then have the pair of Power Transistors

replaced.

If the Unit still wont turn ON, you may have to check for

low voltage regulators.

• If you can try to monitor ( hooking up to other amplifier

or Signal Tracer ) the Line " Out " at the back of the unit

and hear sound , you just eliminated a large percentage

on electronic troubleshooting. ( you may not need to check

for more regulators on the preamp circuits. )


• But have a check on 12V supply/circuit also.


• More thorough troubleshooting details can be done with a

help of a

Denon AVR900S/M

http://www.encompassparts.com/products/?AVR900S/M

( only with a fee ) Click on the link above


Should you need more details , post so I can help you

further.

Regards, and Good luck!


palaboy

Posted on Aug 24, 2010

  • 33 more comments 
  • Rommel Cana
    Rommel Cana Aug 24, 2010



    • you may need to take out the power transistors,

    or test each of them with a Multimeter.


    Check the collector and emitter on each , ( usually the center and the right most pin )


    • If it is a Module have it removed.

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    You may not the sound you need yet, but the blinking should stop.

    • Then you can trace further if audio can reach the inputs on each amplifiers using a Signal

    tracer or another small amplifier


    here are your guide , just in case you need one:


    a ) Start with the input , then to the op-amp IC. b ) check your cable like those above for co

    Source:

    http://www.fixya.com/support/r4008719-di...


    these may not be the same as yours, but the process of troubleshooting is the same




    • Once you can confirm there is audio, it is now time to order on line the part that you will

    be needing to replace..

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    • or can you possibly describe what it looks like ( component that get burnt/smoke ) ?

    or have an image or a picture perhaps if you cannot describe it.

  • Chris Davis
    Chris Davis Aug 24, 2010

    I unsoldered a transister I believe. Its square with 3 prongs coming out bottom. When I took it out I put it all back together. Put in new fuses and hit the power. It came on the display came on for a few seconds then went to protect.

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    Thanks for the quick response!


    • It is not only one transistor , they are transistors ( see the link above ).


    They ( transistors ) are in pairs.


    It is an NPN and PNP type.


    • One way to isolate is to have it all remove.

    But put something in there to mark what you have extracted.


    Say C X X X X ( NPN ) and A X X X X ( PNP ),


    we will have to deal with these later.




    • Once the protect does not appear anymore, and the fuse is not blowing ,


    Then check all the component that you have extracted , one by one.


    And post , before you put it back.

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    • transistors may look like these:





    These transistors are mounted on the aluminum heatsink

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    Without these Power Transistors connected ,

    • It should not blow fuses

    • There should be no sign of protect.


    If protect still appears do not put back the said transistors and we will troubleshoot more.


    • Look for you Multimeter and you will measure Offset Voltages on each amp out

    ( without the power transistors )

  • Chris Davis
    Chris Davis Aug 24, 2010

    Ok I pulled the next one also know it stays on so those were the problem. Now I am wondering how to go about finding these replacements. I also noticed a burned resister right by those two transistors. How can I find the value? I have the number off of the circuit board

  • Chris Davis
    Chris Davis Aug 24, 2010

    Ok I pulled the next one also know it stays on so those were the problem. Now I am wondering how to go about finding these replacements. I also noticed a burned resister right by those two transistors. How can I find the value? I have the number off of the circuit board

  • Chris Davis
    Chris Davis Aug 24, 2010

    Ok I pulled the next one also know it stays on so those were the problem. Now I am wondering how to go about finding these replacements. I also noticed a burned resister right by those two transistors. How can I find the value? I have the number off of the circuit board

  • Chris Davis
    Chris Davis Aug 24, 2010

    Ok I pulled the next one also know it stays on so those were the problem. Now I am wondering how to go about finding these replacements. I also noticed a burned resister right by those two transistors. How can I find the value? I have the number off of the circuit board

  • Chris Davis
    Chris Davis Aug 24, 2010

    Ok I pulled the next one also know it stays on so those were the problem. Now I am wondering how to go about finding these replacements. I also noticed a burned resister right by those two transistors. How can I find the value? I have the number off of the circuit board

  • Chris Davis
    Chris Davis Aug 24, 2010

    Ok I pulled the next one also know it stays on so those were the problem. Now I am wondering how to go about finding these replacements. I also noticed a burned resister right by those two transistors. How can I find the value? I have the number off of the circuit board

  • Chris Davis
    Chris Davis Aug 24, 2010

    Would you know where I can find these transistors .

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    OK, now , if the unit now turns ON , and there is no more protect ,

    no more blowing of fuses then.....




    • you may have to replace the component later , after you can hear sound on other channel.


    sample :

    you can connect a small speaker there might be a small sound , not like the original one

    which have a loud and strong Audio.


    • just see to it that the audio you are hearing is OK ( clear ), although a weak one.


    When it does , you are ready to order parts on line.


    post the number or letters printed on the transistor and i will look , where you can find it.


    it might also include resistor , be sure to check everything before connecting a new one

    and post

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    you can test the unit , without the power transistor for a whole day, just to insure your new

    power transistor will not get damage.


    • Before hooking up the new , insure the resistors with it are OK , or your new transistor will blow

    same with the fuse.


    Since it is only one pair, other channel will work ( will have audio ) Normally speaking.


    The channel ( wherein there is no power transistor ) should work only with a weak but clear

    audio on a small speaker.

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    • If the Audio ( on the channel which have no Power transistor ) have a distorted ( although weak )


    you may need to extract the other pair connected to it .


    • If you have Multimeter , insure also that the Offset voltage should not be over 0.7V

    ( output of that amp ) before applying the new replacements.

  • Chris Davis
    Chris Davis Aug 24, 2010

    The numbers are A1633, and C4278. And also the resistor is blown and I cant see the color codes.

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    • If the transistor is marked with ( sample only ) C5200

    it means it is 2SC5200


    • If the transistor is marked with A1943


    it means it is 2SA1943

  • Chris Davis
    Chris Davis Aug 24, 2010

    on the chanel without transistors there is no sound at all

  • Rommel Cana
    Rommel Cana Aug 24, 2010


    If the resistor is connected to the " Emitter " ( rightmost pin of the transistor ) it is safe to use

    0.33 ohms 5 watts as replacement.


    If it is connected on the leftmost pin , then you can measure the value it is still in there although

    burnt. and post

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    just like i said before , it is a pair , ( two in each channel )


    Each ( NPN ) has a drive before it goes to your speaker ,


    same with the PNP it is in a Darling ton Configuration.


    • Check the component ( transistor again ) that is connected on the base of that NPN transistor

    same with the PNP transistor , or have it removed too.


    It is also a pair like the one you have extracted and post , it could be connected to the

    resistor that have burnt.


    Base means leftmost pin of the power transistor

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    • It will also be marked with C X X X X and A X X X X only smaller than the power transistor you have

    extracted a while ago , and post

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    • there will also be a single little transistor , that is connected on that Drive , connected on the

    base of that pair , it should also be needing to be replaced.


    it starts with C X X X X or other part number another NPN type small signal transistor

  • Chris Davis
    Chris Davis Aug 24, 2010

    yes the resistor is on the base side.

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    Here is the transistor you need to look


  • Rommel Cana
    Rommel Cana Aug 24, 2010



    the resistor value is 4.7 ohms 1/4 watt






    Have you found the small transistor?

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    the collector of that transistor is connected to the burnt resistor .


    • Collector could be center pin of the transistor if the part number starts with C or D

    like D947 which is equivalent to 2SD947F

  • Chris Davis
    Chris Davis Aug 24, 2010

    Sorry I have to go to work. thanks for the help i will try back later when I get off thanks again

  • Rommel Cana
    Rommel Cana Aug 24, 2010



    Here are other things to check :






    If these are not checked properly , you might end up , same all over again

  • Rommel Cana
    Rommel Cana Aug 24, 2010
  • Rommel Cana
    Rommel Cana Aug 24, 2010
  • Rommel Cana
    Rommel Cana Aug 25, 2010



    Have you found the small transistor?

  • Rommel Cana
    Rommel Cana Aug 25, 2010



    • that small transistor is connected to the trimmer resistor ( blue arrow )






    See the schematics above for schematics , you need to find these one .

    Before putting back a new pair of Darlington Power Transistors.


    • These transistor is the life of your pair, if these is not checked

    you might not like what will happen later.and post

  • Rommel Cana
    Rommel Cana Aug 25, 2010



    On the trimmer resistor , On One end

    • A resistor is connected that goes to the Collector side of the transistor you need to look,

    On the other end also a resistor that goes to the emitter of that transistor.


    these transistor should also be needed to be replaced with a new one.


    • Do not forget to check the resistors too , before putting back a new small transistor.

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